/************************ (C) COPYLEFT 2010 Leafgrass *************************

* File Name		: os_cpu_c.c
* Author		: Librae
* Date			: 06/10/2010
* Description	: μCOS-II在STM32上的移植代码C语言部分，
*				  包括任务堆栈初始化代码和钩子函数等

******************************************************************************/

#ifndef __OS_CPU_H__
#define __OS_CPU_H__

#ifdef OS_CPU_GLOBALS
#define OS_CPU_EXT
#else
#define OS_CPU_EXT extern
#endif

/******************************************************************************
 *                    定义与编译器无关的数据类型
 ******************************************************************************/

typedef unsigned char BOOLEAN;
typedef unsigned char INT8U;   /* Unsigned  8 bit quantity       */
typedef signed char INT8S;     /* Signed    8 bit quantity       */
typedef unsigned short INT16U; /* Unsigned 16 bit quantity       */
typedef signed short INT16S;   /* Signed   16 bit quantity       */
typedef unsigned int INT32U;   /* Unsigned 32 bit quantity       */
typedef signed int INT32S;     /* Signed   32 bit quantity       */
typedef float FP32;            /* Single precision floating point*/
typedef double FP64;           /* Double precision floating point*/

// STM32是32位位宽的,这里OS_STK和OS_CPU_SR都应该为32位数据类型
typedef unsigned int OS_STK;    /* Each stack entry is 32-bit wide*/
typedef unsigned int OS_CPU_SR; /* Define size of CPU status register*/
/*
*******************************************************************************
*                             Cortex M3
*                     Critical Section Management
*******************************************************************************
*/

/*
*******************************************************************************
*                          ARM Miscellaneous
*******************************************************************************
*/

// 定义栈的增长方向.
// CM3中,栈是由高地址向低地址增长的,所以OS_STK_GROWTH设置为1
#define OS_STK_GROWTH 1 /* Stack grows from HIGH to LOW memory on ARM    */
// 任务切换宏,由汇编实现.
#define OS_TASK_SW() OSCtxSw()

/*
*******************************************************************************
*                               PROTOTYPES
*                           (see OS_CPU_A.ASM)
*******************************************************************************
*/
// OS_CRITICAL_METHOD = 1 :直接使用处理器的开关中断指令来实现宏
// OS_CRITICAL_METHOD = 2 :利用堆栈保存和恢复CPU的状态
// OS_CRITICAL_METHOD = 3 :利用编译器扩展功能获得程序状态字，保存在局部变量cpu_sr

#define OS_CRITICAL_METHOD 3 // 进入临界段的方法

#if OS_CRITICAL_METHOD == 3
#define OS_ENTER_CRITICAL()        \
    {                              \
        cpu_sr = OS_CPU_SR_Save(); \
    }
#define OS_EXIT_CRITICAL()         \
    {                              \
        OS_CPU_SR_Restore(cpu_sr); \
    }
#endif

void OSCtxSw(void);
void OSIntCtxSw(void);
void OSStartHighRdy(void);

void OSPendSV(void);

#if OS_CRITICAL_METHOD == 3u /* See OS_CPU_A.ASM                                  */
OS_CPU_SR OS_CPU_SR_Save(void);
void OS_CPU_SR_Restore(OS_CPU_SR cpu_sr);
#endif
OS_CPU_EXT INT32U OSInterrputSum;

#endif

/************************ (C) COPYLEFT 2010 Leafgrass ************************/
